Obviously, the Joker and Harley Quinn are the most popular. The Joker's chaotic and unpredictable nature makes for great story - telling. He can be the main source of conflict and drama. Harley Quinn, on the other hand, has a complex character. Her love for the Joker despite his abuse, and her own journey of self - discovery are very interesting to explore in fanfiction.
Batman also often appears in these fanfictions. He serves as the antithesis to the Joker and Harley Quinn's chaos. His attempts to stop their criminal activities or even his interactions with them in non - combat situations add depth to the stories. For example, there could be a fanfiction where Batman tries to reason with Harley Quinn to leave the Joker.
Sometimes other villains from the Gotham universe like Poison Ivy also show up in the fanfiction. Her relationship with Harley Quinn, especially if they team up against the Joker or with him, can create some really interesting and unique storylines. For instance, Poison Ivy might try to convince Harley Quinn that the Joker is not worthy of her love.
Batman himself can also be a significant character in harley quinn x joker fanfiction. His constant pursuit of the Joker and his complex relationship with Harley Quinn (as he sometimes tries to save her from the Joker's influence) can add depth and more plotlines to the fanfiction.
The Dark Knight's version of the Joker adds an extra layer of darkness to their relationship in fanfiction. Writers might explore how the Joker's chaos affects Harley even more in this darker context. For example, Harley could be torn between her love for the Joker and the realization of the horror he spreads in Gotham.
Harley Quinn herself is extremely popular. Her complex relationship with the Joker, her wild and unpredictable nature, and her journey of self - discovery make her a fascinating character to write about. Writers often explore her different facets, from her being a victim of the Joker's abuse to her trying to find her own identity outside of their relationship.
One interesting storyline could be Harley Quinn trying to break free from the Joker's control. In fanfiction, she might start to realize his true nature of using her and decides to rebel. This could lead to a power struggle between them.
In fanfiction, the Joker and Harley Quinn can have a huge impact on Gotham. Their antics can range from small - scale chaos like random acts of vandalism to large - scale threats like trying to take over key parts of the city. They are often portrayed as a force that the police and Batman constantly struggle to contain.
The Riddler could also be a good character. His riddles and puzzles could be a part of the plot where the Joker and Harley Quinn are either trying to solve them or are being set up by the Riddler for some devious plan. And his intelligence can create interesting power dynamics with the Joker.
They're popular because their relationship is so complex and intense. The Joker is this chaotic, unpredictable character and Harley is completely devoted to him, despite his abuse. It makes for a really interesting dynamic to explore in fanfiction.
Harley Quinn could also be shown as a tragic figure. In the Dark Knight fanfiction, she could be a product of Gotham's corrupt system. Maybe she was failed by the very institutions that were supposed to protect her, which led her to a life of crime. This would add depth to her character and make her more than just a crazy villain.
One popular Harley Quinn and Joker fanfiction is 'The Redemption of Harley'. It explores the idea of Harley breaking free from the Joker's control and finding her own path. Another is 'Joker's New Game' which delves into a new scheme of the Joker with Harley by his side in a more complex and dark plot. And there's also 'Harley's Secret Diary' that gives an inside look into Harley's thoughts and feelings regarding her relationship with the Joker.
One popular theme is Harley's redemption. Writers often explore how she can break free from the Joker's influence and find her own identity. Another theme is the origin of their relationship, like how Harley became so obsessed with the Joker in the first place.